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Microchip Technology AT49F002AN-55JI
- Part No.:
- AT49F002AN-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002AN-55JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,393
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Product details
Overview
AT49F002AN-55JI from Atmel is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory with 55 ns read access time, 20 µs/byte programming, and sector-based erase architecture including one 16K-byte boot block with programmable lockout. It operates across the industrial temperature range (−40°C to +85°C) and delivers 30 mA active current and 100 µA CMOS standby current for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F002AN-55JI datasheet, AT49F002AN-55JI pinout, AT49F002AN-55JI application, or AT49F002AN-55JI equivalent, key selection considerations include boot-block protection capability, 4-second chip erase time, DATA polling and toggle-bit end-of-operation detection, sector-level reprogrammability, and PLCC-32 packaging with NC on pin 1.
Technical Context
The AT49F002AN-55JI implements a standard parallel Flash interface with CE/OE/WE control logic, supporting EPROM-like read timing and command-based byte programming and sector erasure. Its internal program controller manages 20 µs/byte writes and 4-second full-chip erases without external clocks.
It features hardware data protection via VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes). The boot block lockout-enabled by a six-cycle command sequence-permanently protects 16K bytes of secure startup code at address 00000H–03FFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), sufficient for firmware images up to 256 KB in size |
| Read Access Time | 55 ns - enables direct execution from Flash in 20 MHz+ bus systems |
| Byte Programming Time | 20 µs typical - supports field firmware updates with sub-100 ms per 5 KB block |
| Erase Cycle Time | 4 seconds max for full chip - allows predictable update windows in production test |
| End-of-Operation Detection | DATA polling (I/O7 complement) and toggle-bit (I/O6) - eliminates need for fixed delay timers in host firmware |
| Power Dissipation | 30 mA active / 100 µA CMOS standby - suitable for low-power industrial controllers with sleep modes |
| Write Endurance | 10,000 program/erase cycles - validated for frequent field upgrades over 5+ year product life |
Pinout & Package
AT49F002AN-55JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package per JEDEC MS-016, Variation AE. Pin 1 is designated as No Connect (NC) per device specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A11 is don't-care in command cycles |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; I/O7 used for DATA polling, I/O6 for toggle-bit status |
| CE | Chip Enable | Active-low chip select; must be low with OE low for valid read access |
| OE | Output Enable | Active-low output gate; controls data bus tristate to prevent contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming |
| RESET | Reset Input | Halts ongoing operations and forces high-impedance outputs; not used for boot-block override (unavailable on AN variant) |
| VCC | Power Supply | +5.0 V ±10% supply; VCC sense circuit disables programming if voltage drops below 3.8 V |
| GND | Ground | Reference for all input thresholds and output levels; decoupling required within 10 mm of VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V supply operation | Eliminates need for 12V programming voltage rails, simplifying power design and reducing BOM cost |
| Boot block programming lockout | Enables permanent protection of 16K-byte startup code region (00000H–03FFFH), preventing accidental corruption during field updates |
| Sector architecture | Supports selective erasure of four main memory blocks (32K/64K/64K/64K) and two 8K parameter blocks - minimizes update time and wear leveling overhead |
| Hardware data protection | Combines VCC sensing, control-line inhibition, and noise filtering to prevent spurious writes in electrically noisy industrial environments |
| DATA polling & toggle-bit | Provides deterministic, software-driven confirmation of program/erase completion without fixed delays or external timers |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Protection |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability and hardware-protected boot sector. Use Value: Enables remote firmware patches without physical device replacement while ensuring bootloader integrity against unauthorized modification. | Use Scenario: Securing boot code and calibration data in portable diagnostic equipment requiring regulatory-compliant firmware validation. IC Role / Device Role / Timing Role: Trusted boot memory with lockout-enabled 16K-byte protected region for FDA/IEC 62304 compliance. Use Value: Guarantees that certified startup routines remain unaltered between clinical software updates, satisfying traceability and revision control requirements. |
| Automotive ECU Parameter Tables | Networking Equipment Configuration Storage |
Use Scenario: Holding engine calibration maps and emission control parameters in engine control units subject to OBD-II reprogramming protocols. IC Role / Device Role / Timing Role: Field-updatable parameter memory with sector-erase granularity for targeted map revisions. Use Value: Allows OEMs to deploy fine-grained calibration updates (e.g., single 8K parameter block) without erasing full firmware, reducing flash wear and update time. | Use Scenario: Storing MAC addresses, VLAN settings, and firmware configuration profiles in managed Ethernet switches. IC Role / Device Role / Timing Role: Persistent configuration storage with fast byte-write capability for dynamic runtime updates. Use Value: Supports zero-downtime configuration changes via host processor writes without requiring full device reset or extended erase cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002A-55JI | No boot block lockout override via RESET; identical timing, density, and PLCC-32 package | Lacks boot block lockout feature entirely - unsuitable where secure bootloader protection is required | Select only if boot block protection is unnecessary and legacy compatibility with non-lockout variants is prioritized |
| AT49F002ANT-55JI | Boot block located at 3C000H–3FFFFH instead of 00000H–03FFFH; same lockout functionality and timing specs | Requires address remapping in host firmware to access boot sector; intended for designs needing top-of-memory layout | Choose when system architecture allocates boot code at upper memory boundary and requires identical protection behavior |
Compared with AT49F002A-55JI, the AT49F002AN-55JI adds boot block lockout for secure firmware staging, while AT49F002ANT-55JI relocates that protected region to high memory - both retain identical 55 ns access, 20 µs programming, and PLCC-32 mechanical compatibility.
Availability
AT49F002AN-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code protection, and automotive ECU parameter table management requiring stable component supply and long-term lifecycle support.
Supply support for AT49F002AN-55JI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for embedded systems.
The AT49F002A(N)(T) family was designed as a drop-in upgrade path from EPROMs, delivering in-system reprogrammability, sector protection, and industrial-grade reliability for firmware and configuration storage in resource-constrained controllers.
FAQ
What is the function of pin 1 on the AT49F002AN-55JI?
Pin 1 on the AT49F002AN-55JI is designated as No Connect (NC) per the official Atmel datasheet. It is electrically isolated and must not be connected to any signal or power net on the PCB. This NC designation applies specifically to the PLCC-32 package variant indicated by the "J" suffix in AT49F002AN-55JI and differs from TSOP/VSOP variants where pin 9 is NC.
Does the AT49F002AN-55JI support boot block reprogramming after lockout is enabled?
No, the AT49F002AN-55JI does not support boot block reprogramming after lockout is enabled. Unlike the base AT49F002A(N)T variant, the AT49F002AN-55JI omits the 12V RESET override feature. Once the six-cycle lockout command sequence is executed, the 16K-byte boot block (00000H–03FFFH) becomes permanently write-protected under standard 5V operation.
How is end-of-program detection implemented in the AT49F002AN-55JI?
The AT49F002AN-55JI implements end-of-program detection via DATA polling on I/O7 and toggle-bit monitoring on I/O6. During programming, reading the target address returns the complement of the written data on I/O7; when complete, true data appears. Simultaneously, I/O6 toggles between 0 and 1 until completion, then stabilizes - both methods allow host firmware to avoid fixed delays.
What is the maximum erase time for a full chip erase on the AT49F002AN-55JI?
The maximum erase time for a full chip erase on the AT49F002AN-55JI is 4 seconds, as specified in the AC characteristics table. This time is internally controlled by the device and requires no external clocking. The actual typical erase time is also 4 seconds, with a maximum of 8 seconds under worst-case conditions per characterization data.
Can the AT49F002AN-55JI be used in place of an EPROM without hardware changes?
Yes, the AT49F002AN-55JI is pin-compatible and functionally compatible with standard 27C256 EPROMs in read mode: it uses identical CE/OE/WE control signals, outputs valid data within 55 ns, and presents high-impedance outputs when deselected. However, programming requires command sequences instead of UV erasure, so host firmware must implement the six-cycle chip erase and four-cycle byte program protocols.
AT49F002AN-55JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002AN-55JI FAQ
1.How can I place an order for AT49F002AN-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002AN-55JI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT49F002AN-55JI reliable?
The price and inventory of AT49F002AN-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002AN-55JI is usually 5 days.
3.What payment methods are accepted for AT49F002AN-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002AN-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002AN-55JI?
AT49F002AN-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002AN-55JI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT49F002AN-55JI?
For technical support, including AT49F002AN-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002AN-55JI requirements.
6.How does Aetrix verify that AT49F002AN-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F002AN-55JI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT49F002AN-55JI meets industry standards.
7.What is the process for return or replacement of AT49F002AN-55JI?
All AT49F002AN-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002AN-55JI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT49F002AN-55JI part is unused and in its original packaging.
Return procedure for AT49F002AN-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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